Webdav responds with 500 when in maintenance mode (Autoloading issue)

[nickvergessen]

Steps to reproduce

1. Enable maintenance mode
2. curl -v http://localhost/remote.php/webdav/

Expected

HTTP/1.1 503 Service Unavailable with #19075
or
HTTP/1.1 401 Unauthorized without #19075

Actual

HTTP/1.1 500 Internal Server Error

Page content:

Type: OCP\AutoloadNotAllowedException

Message: Autoload path not allowed: /home/nickv/ownCloud/master/core/apps/files/lib/app.php
File: /home/nickv/ownCloud/master/core/lib/autoloader.php:134

Trace
#0 /home/nickv/ownCloud/master/core/lib/autoloader.php(154): OC\Autoloader->isValidPath('/home/nickv/own...')
#1 [internal function]: OC\Autoloader->load('OCA\\Files\\App')
#2 /home/nickv/ownCloud/master/core/apps/files/appinfo/app.php(47): spl_autoload_call('OCA\\Files\\App')
#3 /home/nickv/ownCloud/master/core/lib/private/app.php(158): require_once('/home/nickv/own...')
#4 /home/nickv/ownCloud/master/core/lib/private/app.php(139): OC_App::requireAppFile('files')
#5 /home/nickv/ownCloud/master/core/remote.php(132): OC_App::loadApp('files')
#6 {main}

@Xenopathic

[DeepDiver1975]

@Xenopathic @nickvergessen is there a fix coming up? THX

[nickvergessen]

@Xenopathic has to take this, I'm busy with other stuff

[RobinMcCorkell]

@LukasReschke regressed this, as I said would happen in #19039 (comment). I'll fix it...